JPH01142116A - Intake gate controller - Google Patents

Abstract

PURPOSE:To improve the respondence of an intake gate controller by a method in which an intake gate is controlled by a quick control circuit for great changes in the amount of water taken, whereas the gate is controlled by a fine regulating control circuit for small change. CONSTITUTION:On the basis of data of a circuit 13 to detect the deviation between data of a water intake amount setter and data of a flow meter set on a place away from an intake gate 3, the opening degree of the gate 3 is controlled by a fine regurating control circuit 18. Also, on the basis of data on water level of an intake pond 1, the opening degree of the gate is controlled by a quick regulating control circuit 14. A selective switch circuit 19 is provided so that control is made by the latter for great changes and control is made by the former for small change. The quick respondence and steadiness characteristics can thus be improved.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is applicable to 1. For example, when controlling the amount of water intake from a reservoir provided in a heavy section to control the output amount of a power plant, or as agricultural water or drinking water. The present invention relates to a water intake gate control device for controlling the water intake gate of a reservoir when controlling the amount of water intake in accordance with the demand at downstream consumption areas.

"Prior Art" Generally, in order to match the amount of water actually taken per unit time from a reservoir with the amount of water that has been set in advance, a water intake amount setting circuit (21) is used as shown in Fig. 4. The comparison circuit (23) compares the set water intake amount with the measured value measured by the flowmeter (7), and inputs a signal corresponding to the deviation Ei to the controller (24).
The gate elevator (6) is controlled by the output U of the gate (3).
A method is adopted to open/close/control the controller (
24), it has been customary to use a PID controller or the like.

However, it is extremely important for a water intake amount control device to control the amount of water intake so that it matches the required amount of water intake, and the flowmeter for this purpose should preferably be installed near this gate (3). 3) and the flow meter (7), which is desirable, but accurate measurements cannot be made due to turbulence near the gate (3), and the headrace channel from the reservoir is a tunnel channel. In such cases, use a flow meter (
If 7) is installed at a rectification location near the settling basin after this tunnel waterway, there will be no turbulence and accurate measurements can be made, but the distance from the reservoir to the location where the flow meter (7) is installed is too long.
The following problems occurred.

"The problem that the invention attempts to solve" The distance between the water intake gate (3) and the flow meter (7) is long.

If the flow rate changes too much, there will be a large time delay until the flow rate change due to the change in the opening degree of the gate (3) is detected by the flow meter (7).
This control system included dead time, and the control system did not operate well under the use of conventional PID controllers. In other words, when the gain of the controller (24) is increased, the control system becomes unstable, and as a result, the amount of water intake fluctuates greatly up and down, and this fluctuation does not subside easily.On the other hand, when the gain of the controller (24) is decreased, the amount of water intake becomes unstable. There is a problem in that when the value of the setting circuit is changed, it takes a long time until the actual water intake amount approaches the set water intake amount.

The object of the present invention is to improve rapid solubility and steady-state characteristics with a relatively simple control device, and to provide a practical and effective control device. - Means for Solving the Problems - In order to achieve the above object, the present invention provides an intake gate for controlling the amount of water intake at the intake of a reservoir, and a flow meter at a rectification location away from the intake gate. Installed.

In a device that measures the flow rate with this flow meter and controls the flow rate to the flow rate set in the water intake amount setting device, deviation detection detects a flow rate deviation by comparing the data of the water intake amount setting device and the data of the flow meter. a fine adjustment control circuit that outputs an opening control signal for the water intake gate based on the deviation data of the deviation detection circuit, and a preset calculation based on the water level data of the intake reservoir and the data of the water intake amount setting device. A quick response adjustment control circuit calculates the gate opening according to a formula and outputs a gate opening control signal, and a fine adjustment control circuit selects the fine adjustment control circuit when the flow deviation value of the deviation detection circuit is less than a certain threshold. The device includes a selection switching circuit that selects the immediate response control circuit when the value exceeds a certain threshold.

"Function" The set value data of water intake amount and the actual flow rate data are input to the deviation detection circuit to find the deviation value, and if the deviation value E1 exceeds a certain threshold range, immediate response is taken.

The quick response control circuit 1, which controls the gate with the control circuit, makes the actual gate opening match the target gate opening calculated by the gate opening calculation circuit based on the water intake amount set value and the water level data of the water level meter. to control.

Then, since this control system does not include a dead time element, the actual gate opening is controlled to quickly approach the target gate opening. In other words, if the threshold value is set to a value that takes into account the error between the model used in the gate opening degree calculation circuit and the actual gate, when the deviation data exceeds the range of this threshold value, the Control is performed to fall within the range of this threshold value.

Next, when the deviation detection circuit detects that the * deviation data falls within the range of the threshold value, it switches to the fine adjustment control circuit and controls the gate.

The fine adjustment control circuit directly controls the gate opening based on the deviation between the set amount of water intake and the flowmeter measurement data, and the control output is based on the water landing time from the gate to the flowmeter setting location. Since it is output at fixed time intervals, it takes a long time to settle, but the deviation is minute and the control system does not become oscillatory, and the deviation is asymptotically attenuated.

Moreover, when the deviation is within the range of the threshold value from the beginning, the fine adjustment control circuit performs the control from the beginning.

"Example" Hereinafter, the present invention will be described in detail based on FIGS. 1, 2, and 3.

In Figure 2, (1) is a reservoir. This reservoir (
A gate (3) that can be opened and closed for controlling the amount of water intake is provided at one water intake port (2) on the periphery of the tank 1). It is assumed that the water intake (2) is led to the sand settling pond (5) by a headrace (4) consisting of a topographically quite long tunnel waterway. A flowmeter (7) for measuring the flow rate is installed near the outlet and mouth of the sand settling basin (5) in the headrace channel (4) in a rectified state. A water level gauge (8) is installed in the reservoir (1).

Next, in FIG. 1, a gate opening meter (9) is placed facing the water intake gate (3) to measure the gate opening.
is installed, and a gate elevator (6) for controlling the opening and closing of the gate (3) is also provided. The flow meter (7), the water level meter (8), and the gate opening meter (9) are coupled to an input signal verification processing circuit (11) of the gate control device I (10). The flow rate data output side of this input signal verification processing circuit (11) is connected to the water intake amount setting circuit (
21) and the deviation detection circuit (13), and the water level data output side is coupled together with the water intake amount setting circuit (21) to the gate opening calculation circuit (15) of the immediate adjustment control circuit (14); Further, the gate opening data output side is coupled to a comparison circuit (16) of the immediate adjustment control circuit (14). The output side of this comparison circuit (16) is coupled to the input side of the control circuit (1)) of the immediate adjustment control circuit (14). The deviation detection circuit (13) has a deviation data line side connected to a selection switching circuit (13) via a fine adjustment control circuit (18).
19) and further coupled to the immediate response adjustment control circuit (14).
) is coupled to the input side of the selection switching circuit (19), and the output side of this selection switching circuit (19) is connected to the gate elevator (6).
is combined with

Next, the operation of the apparatus according to the present invention will be explained.

The signals of the flow meter (7), the water level meter (8), and the gate opening meter (9) are input to the input signal verification processing circuit (11), which performs data verification, BCD check, odd parity check, measurement range deviation check, Verification such as sudden change check is performed and processed, and flow rate data, water level data, and gate opening data are output. The data set in advance by the water intake amount setting circuit (21) and the flow rate data of the input signal verification processing circuit (11) are input to the deviation detection circuit (13), and the deviation E is inputted into the deviation detection circuit (13).
1 is determined, and this deviation E1 is sent to the selection switching circuit (19) and the fine adjustment control circuit (18).

Here, if the deviation E1 exceeds the range of the threshold value, the immediate response adjustment control circuit (14) is selected and coupled to the gate elevator (6), and the following immediate response adjustment control is performed.

First, the installation data of the water intake amount setting circuit (21) and the water level data of the input signal verification processing circuit (11) are sent to the gate opening calculation circuit (15). The target opening degree a of the gate (3) is calculated and output.

The target opening degree a is calculated according to equation (1).

, a = Qs/C-B-(Ti'E';
-(1) In formula (1), Qs is the water intake amount setting circuit (2
1), C is the flow rate coefficient of the gate (3), and B is the outflow of the gate (3). In addition, h is the average depth of the opening of the gate (3) shown in Fig. 3, and is the average depth of the opening of the gate (3) shown in Fig. 3. This is a value determined by the gate opening degree a determined by equation (1). To eliminate the influence of waves, the water level is sampled at approximately 2 second intervals, and
A moving average value obtained by simply averaging 0 data is used, and the gate opening degree a is also updated each time.

"'M'*Gate i degree calculation circuit) The target opening = calculated by the gate i degree calculation circuit) and the gate opening data of the input signal verification processing circuit (11) are compared in the comparison circuit (16), and this comparison value Based on E3, the control circuit (17) outputs a gate control signal Ur and sends it to the gate elevator (6) via the 1 selection switching circuit (19).
6) is the gate (3) that approaches the calculated target opening degree a.
) to rise or fall. The opening degree of this gate (3) is measured by an opening meter (9), and the input signal verification processing circuit (11)
Comparison circuit (16) of the immediate adjustment control circuit (14) via
feedback has been provided. Through this feedback control, the gate opening degree of the gate (3) converges to the target opening degree a, approaches the value Qs set by the actual flow rate indication water intake amount setting circuit (21) flowing from the gate (3), and the deviation detection circuit (
13) deviation E decreases.

When the deviation Ei of the deviation detection circuit (13) converges within the range of the threshold value, the selection switching circuit (19) selects the gate (3).
After a predetermined time taking into consideration the landing time from the flowmeter to the flowmeter (7), the fine adjustment control circuit (18) is switched on.

This fine adjustment control circuit (18) outputs a control signal Uf at regular time intervals. When the deviation E1 of the deviation detection circuit (13) is within the threshold value, the selection switching circuit (19) selects the fine adjustment control circuit (18), and the gate (3) is controlled via the gate elevator (6). , the flow rate from the gate (3) is fed back to the deviation detection circuit (13) via the flowmeter (7) and the input signal verification circuit (11).

In the above embodiment, the control signal output from the fine adjustment control circuit (18) has been described as having a continuous value, but it has been described that the control signal output from the fine adjustment control circuit (18) takes discrete values, for example, only two values, +1 and -1. It may be something like control.

"Effects of the Invention" Since the present invention is configured as described above, even if the distance from the water intake gate to the flow meter installation location is long, the immediate control circuit can respond to large changes in the set water intake amount. E1 is quickly followed so that it falls within a certain range, and when the deviation E1 of water intake becomes small, the fine adjustment control circuit removes the influence of dead time due to the delay in water landing and performs a gentle operation. The water intake amount deviation E1 is controlled to be within an allowable range. Furthermore, it does not require a large-scale control device or large-scale measuring device, and can be realized with a very simple control device and measuring device. Therefore, the present invention has the effect that practically effective control can be performed by an inexpensive control device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the intake gate control device according to the present invention, Fig. 2 is an explanatory diagram of an actual arrangement example, Fig. 3 is a perspective view of the intake gate, and Fig. 4 is a conventional FIG. 2 is a block diagram of a control method. (1)...Reservoir, (2)...Water intake, (3)...
・Intake gate, (4)...headrace, (5)...sand basin, (6)...gate elevator, (7)...flow meter, (8)...water level gauge, (9)... Openness gauge, (10)
... Water intake gate control device, (11) ... Input signal verification processing circuit, (13) ... Deviation detection circuit, (14)
... Immediate adjustment control circuit, (15) ... Gate opening calculation circuit, (16) ... Comparison circuit, (17) ... Control circuit, (18) ... Fine adjustment control circuit, ( 19)...
Selection switching circuit, (21)...Water intake amount setting circuit, (23
)...comparison circuit, (24)...controller.

Claims (4)

[Claims] (1) Install an intake gate at the water intake of the reservoir to control the amount of water intake, install a flow meter at a rectification location away from the intake gate, measure the flow rate with this flow meter, and set it on the water intake amount setting device. In a device that controls the flow rate to a set flow rate, there is a deviation detection circuit that compares the data of the water intake amount setter with the data of the flow meter and detects a flow rate deviation, and the water intake is controlled based on the deviation data of this deviation detection circuit. A fine adjustment control circuit that outputs a gate opening control signal, and a gate opening control circuit that calculates the gate opening using a preset calculation formula based on the water level data of the intake pond and the data of the water intake amount setting device, and outputs the gate opening control signal. a quick-response adjustment control circuit that outputs the same, and a selection that selects the fine-adjustment control circuit when the flow rate deviation value of the deviation detection circuit is below a certain threshold value, and selects the quick-response control circuit when the flow rate deviation value exceeds a certain threshold value. A water intake gate control device comprising a switching circuit. (2) The water intake according to claim 1, wherein the fine adjustment control circuit outputs a gate control signal of a constant magnitude so that the deviation data from the deviation detection circuit remains within a dead zone of a certain width. Mouth gate control device. (3) The selection switching circuit immediately switches to the immediate adjustment circuit when the deviation data of the deviation detection circuit exceeds a certain threshold, and when it falls within the threshold, switches to the fine adjustment control circuit after a certain period of time has elapsed. A water intake gate control device according to claim 1 or 2, comprising: (4) The immediate adjustment control circuit includes a gate opening calculation circuit that calculates the gate opening using a preset calculation formula based on the data of the water intake amount setting device and the water level data, and the data of this gate opening calculation circuit. The water intake gate control device according to claim 1, 2, or 3, comprising a control circuit that outputs a gate opening control signal based on a deviation from data of a gate opening meter.